Resin Bonded Diamond & CBN Wheels

1. Selection of Grit Size DIAMOND / CBN :



Effect of Grit Size on Surface Finish US STANDARD MESH Grain Sizes according to FEPA
Diamond CBN
Rough Grinding 60/70 D 251 B 251
70/80 D 213 B 213
80/100 D 181 B 181
100/120 D 151 B 151
Medium Grinding 120/140 D 126 B 126
140/170 D 107 B 107
170/200 D 91 B 91
Finishing 200/230 D 76 B 76
230/270 D 64 B 64
270/325 D 54 B 54
325/400 D 46 B 46
Super Finishing 400/500 D 40 B 40
500/600 D 30 B 30
MICRON GRIT SIZE
20-30 D 25 B 25
15-25 D 20 B 20
10-20 D 15 B 15
8-12 D 10 B 10
4-8 D 7 B 7
2-4 D 3 B 3
1-2 D 1 B 1

3. Concentration :

As a basic value for DIAMOND/CBN concentration in grinding wheels, 100 is equivalent to 4.4 carats per cubic centimeters (0.88 gm/cm³) Other concentrations are worked out prorata from this figure and are given below.

Concentration Wt. of DIAMOND/CBN per CC of the Bondeding Section
25 con. 1.1 ct/cm2
50 con. 2.2 ct/cm2
75 con. 3.3 ct/cm2
100 con. 4.4 ct/cm2

5. How to Order a Full Wheel :

To completely order or specify a wheel the following has to be given.
1. Type of the wheel. 
2. Grite size. 
3. Concentration. 
Specify Dimension   D,   T,   H,   X,   W/U
For special profile wheels include wheel drawing.
Example   :  
Type 1A1   :   Dia.-150   T-12   H-31.75   D/B 126   Con. 50  X 3
Type 4A2   :   Dia.-150   W-6   H-31.75   D/B 126   Con. 50  X 1.5

6. Grind Application :

DIAMOND WHEEL CBN WHEEL
  • Tungsten Carbide
  • Tungsten Carbide &
    Steel comp. materials
  • Ceramics-Oxides/
    Mixed Carbides
  • Ferrites, Graphite
  • Glass-Sheet glass, Optical glass
  • Grey Cast Iron
  • Other non-ferrous non-Metallic materials
  • High Speed steel-HSS
  • Die steels
  • Super Alloys
  • Cast Iron
  • Tool Steels (Un hardened)
  • Other hardened ferrous materials

7. Wheel Peripheral Speed : (Wheel speed meter per second M/S )

MM 8 m/s 12 m/s 16 m/s 18 m/s 20 m/s 22 m/s 26 m/s 30 m/s
10 15280 22930 -- -- -- -- -- --
15 10170 15300 20200 22900 25500 -- -- --
20 7650 11500 15300 17200 19000 21200 25000 28750
25 6125 9180 12250 13775 15300 16850 19900 23000
50 3050 4580 6100 6880 7650 8400 9940 11450
75 2040 3060 4080 4580 5100 5600 6620 7650
90 1700 2550 3400 3820 4250 4670 5520 6370
100 1530 2290 3060 3440 3825 4200 4970 5730
125 1220 1830 2440 2750 3050 3355 3970 4600
150 1020 1530 2020 2290 2550 2800 3300 3800
200 765 1145 1530 1720 1910 2120 2490 2875
250 610 920 1225 1380 1525 1685 1990 2300
300 510 765 1020 1145 1275 1400 1660 1900

8. Grinding Parameters : (For Resin Bonded DIAMOND / CBN Wheels)

Grinding Process Parameter For Diamond For CBN
Surface Grinding Cutting Speed (m/s) 23-26 23-28
Depth of cut (m/s) Roughing 0.05 - 0.08 0.06 - 0.1
Finishing 0.002 - 0.02 0.005 - 0.03
External Cylindrical Grinding Cutting Speed (m/s) 23 - 26 23 - 28
Work piece Speed (m/min) 10 - 20 10 - 20
Depth of cut/in Feed (m/s) Roughing 0.03 - 0.05 0.04 - 0.08
Finishing 0.003 - 0.02 0.004 - 0.03
Internal Grinding Cutting Speed (m/s) 15 - 20 18 - 25
Work piece Speed (m/min) 25 - 30 30 - 35
Depth of cut/in Feed (m/s) Roughing 0.003 - 0.02 0.003 - 0.03
Finishing 0.003 - 0.008 0.003 - 0.05
Tool & Cutter Grinding Cutting Speed (m/s) 15 - 18 18 - 30
Table Speed (m/s) 2 - 3 3 - 5
Work piece Speed (m/min) 25 - 30 30 - 35
Depth of cut/in Feed (m/s) 0.02 - 0.3 0.03 - 0.05

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